| 摘要 |
1,189,718. Dry shavers. GILLETTE CO. 5 July, 1967 [6 July, 1966], No. 31037/67. Heading B4B. [Also in Division C7] A foil 4 having holes therethrough, e.g. as used for screens and shearing foils of electric shavers, is made by forming electrically insulated areas 2 on the surface of a metal base-plate 1 in the areas where it is desired to have the holes, electroplating the rest of the base-plate to provide a metal coating 3 and passivating the metal coating 3 so as to enable the foil 4, which is subsequently electrodeposited, to be stripped from the metal 3. The passivation may be by treatment with bichromate solution. The base-plate 1 with insulation 2 and metal coating 3 serves as a negative for making the foil and can be reprepared by removing the metal coating 3 and insulation and repeating the process. To enable removal of the metal coating 3 without attaching the metal baseplate 1, the coating 3 is of a metal such as Sn or Zn which can be dissolved in an alkaline bath and the base-plate 1 is of metal such as steel, Ni or brass which is resistant to an alkaline bath. Fig. 2 (not shown), illustrates an embodiment where the insulating material is embedded in etched shallow holes in the base-plate. |
